Urban metro tunnels stay in constant high humidity, underground sewage vapor and hydrogen sulfide gas environment all year round. Traditional epoxy lining forms seam gaps during construction, leading to medium leakage and rapid rust of tunnel steel supports. Spray polyurea forms fully seamless film to solve tunnel anti-corrosion pain points.

FLDC complete spray polyurea matching system for metro tunnel steel brackets & embedded steel parts:

1. Epoxy penetration sealing primer for concrete & steel base
2. Fast-curing modified polyurea intermediate layer
3. Anti-mildew polyurea top lining resistant to underground corrosive gas Core Advantages: ✅ Instant curing after spraying, no long maintenance waiting period for tunnel construction ✅ Fully seamless integral film, zero sewage gas leakage risk ✅ Resist H₂S & underground acid sludge long-term erosion ✅ High flexibility, adapt minor tunnel foundation settlement without cracking ✅ Construction temperature range -10℃ ~ 48℃, suitable underground low-temperature environment We supply polyurea lining solutions for global subway renovation projects. Request on-site construction technical manual.